Manufacture of peg-lamps



(No Model.) w

J. DALZELL.

i i MANUFAGTURB 0E PEG LAMPS. y

- No. 274,917. P'aftentedVApr. 3.1883.`

ulm

45 the manufacture.

t UNJTED l STATES PATENT OEEICE. n

` JAMES DALZELL, OF PITTSBURG, PENNSYLVANIA.

MANUFACTU RE oF PEG-LAMPS.

SPECIFIATION forming part of Letters :Patent No.v 274,917, dated April 3, 1883.

Application filed December 28, 1882. (No model.)

I o ofattaching the lamp toa stand, foot, or bracket.

` Heretofore they have been made either by blowing the bowl upon'a solid lump ofglass placedA in a suitable cavity in the bottom of the mold, or by blowing the hollow peg by expanding the glass into the peg-cavity when forming the bowl, or by blowing the glass into a suitable metallic ferrule having contracted edges, so

that the glass will take hold of the ferrule and It is desirable to formzo the peg by the secondmethod; but as a peg secure it to the bowl.

so formed is plain it is dificult to attach the lamp-font to the stem or bracket. stances the sides of the cavity in which the hollow pegis formed have been made with a con- 1 25 tracted neck, so as to make a button-shaped peg; but the eect of such and similar molds is `to cause the glass to be blown too thin at the contracted portion and make the peg liable to be broken off. I overcome all these difficulties 3o by flrst blowing the peg in a plain cavity, and

then, while the glass is still in aplastic condition, indent-ing it by means ot' a suitable plunger or plungers, so as toform external indentations therein, which are suitable for the pur- 3 5 pose of attaching thefont to the stem or bracket.

To enable others skilled in the art to make and use my invention, I will now describe it by reference to the accompanying drawings,rin which- 4o Figure lis a vertical section of my improved lampmoldfand stand, illustrating one step of the process ot making the lamp. Fig. 2 is a like view of the moldstanti and a portion of the lamp-bowl, illustrating the second step of Fig. 3 is a sideelevationof the mold-treadle.

Like letters of reference indicate like parts in each. Y

The lamp-mold e is of any suitable construction, and is placed on a stand, b, having a bottom plate, c, in which is a peg-cavity, d. The

In someinp bottom plate, c, projects above the surface of the stand b, and when in use the mold is closed around it, asindicated in Fig. l. In the bottom plate, c, are two sliding plungers, e,placed in suitable grooves, c', whichy extend into the peg-cavity d. The plungers e are operated by leyers f, pivoted to the under side ofthe stand b, or to a suitable block, g, thereon. VThe other ends of the angle-levers f are pivotally connected to the cross-bar h, which is attached by a strap or yoke, h', to a weighted treadle, z'. The treadle t' is pivoted to the stand at fi', and is provided with a foot piece, i2, at the front side and a weight, 3, at the rear side. The angle-levers f, cross-bar h, and treadlet are so arranged with reference to the plungers e that when the foot is placed upon the foot-piece t2 and the treadle raised the plungers e are forced into the cavity d, and when the foot is removed the weight t3 causes the cross-bar h to be drawn down and the frontends of the levers fto throw the plungers c back outof the cavity c.

Thus constructed, my improved apparatus is used as follows: The workman gathers the requisite quantity ot' glass upon his'pipe and places it in the mold a, and then closes the mold and blows the lamp in the usual way. Theglass, expanding into the peg cavity d, forms a straight hollow peg having walls of uniform thickness with those of the font It'. When the blowing is completed he places his foot on the step t2, throws up the treadle t', and thereby forces the plun gers e inwardly against the sides of the hollow peg, as shown in Fig. 2. This causes two indcntations to be formed in the opposite sides ofthe hollow peg d', which constitute means for the attachment of the lamp to its stem or bracket. He then takes his foot oft' ofthe step t? and permits` the weight i3 to fall, which causes the plungers e to be withdrawn. He then opens the mold and removes thelamp. font. In this way I am enabled to provide means for the safe attachment of thelamp-font to its stem without reducing the thickness ot' the glass of the peg, and thereby weakening or otherwise injuriously affecting-it. The sides of the peg at the indented portions are not reduced in thickness, and the glass, being in a plastic condition, is not liable to fracture by reason ot' being indented. No additional time,

IOO.

.manufacture of that article alone.

labor, or skill is required in effecting this reis in a plastic condition, substantially as and sult, and consequently there is no increase in the cost of the lamp. y

I do not limitmyself tothe precise construction shown, but claim broadly amold providedwith means for indenting the hollow peg after the blowing has been completed and while the glass is in a plastic condition in the mold.

I have described my invention in relation to peg-lamps; but I do not limit myself to the I claim also its use in the manufacture of all articles of glassware which are provided with pegs for the attachment ot' the same to a stem, bracket, or other article.

What :I claim as my invention, and desire'to secure by Letters Patent, is-

1. The method ot' forming peg -lamps and similar articles with a hollow peg, consisting in blowing the same in a suitable mold,and then ndenting the hollow peg While the glass for the purposes described.

2. The combination of the peg-lamp or similar mold with devices capable of being forced 25 into the peg-cavity for the purpose of indenting the peg, and then of being Withdrawn therefrom, so that the lamp may be removed from the mold, substantially as and efor the purposes described.

3. The combination of the peglamp or similar mold, sliding plungers capable of being projected into thepeg-cavity andlwithdrawn therefrom, and a treadle foroperating the plungers, substantially as and for the purposes described. v35

In testimony whereof I have hereunto set my hand this 19th day of December, A. D. 1882.

JAMES DALZELL.

Witnesses:

W. B. CoRWIN, T. B. KEER. 

